[Bug 1847587] Re: [SRU] Add entries for Pi 4

[Dave Jones]

** Changed in: flash-kernel (Ubuntu Bionic)
     Assignee: (unassigned) => Dave Jones (waveform)

** Changed in: flash-kernel (Ubuntu Bionic)
       Status: New => In Progress

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Title:
  [SRU] Add entries for Pi 4

Status in flash-kernel package in Ubuntu:
  Fix Released
Status in flash-kernel source package in Bionic:
  In Progress

Bug description:
  Impact
  ======

  The current stable release (bionic) does not support booting on the
  Raspberry Pi 4. Several packages need back-porting from devel to
  support this, along with a new kernel.

  Test Case
  =========

  * Attempt to boot the latest bionic image (18.04.3) on a pi4; note failure
  * Move the SD card to a pi3 and boot successfully
  * Ensure all packages are up to date (apt update/upgrade)
  * sudo add-apt-repository ppa:waveform/pi4
  * sudo apt upgrade
  * sudo apt install linux-image-raspi2-hwe-18.04-edge
  * sudo reboot
  * Ensure boot proceeds successfully on the pi3
  * Move the SD card back to the pi4
  * Ensure boot proceeds successfully on the pi4
  * Repeat for both archs (armhf and arm64)

  Regression Potential
  ====================

  Plenty; pi4 support on bionic requires back-ports of flash-kernel,
  u-boot, linux-firmware-raspi2, and the kernel. Verification of boot,
  and other facilities (USB peripherals, mass storage, free memory, etc.
  etc.) should be performed on both archs and all supported models of pi
  (2, 3, 3A+, 3B+, 4B all memory variants).

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